Rotary fan



(No Model.)

W. H. JOHN-SEN.

ROTARY FAN.

No. 595,571. Patented Dec. 14, 1897.

Invenior 'JiL/ZSCN/ UNITED STATES PATENT OFFICE.

WILLIAM H. JOI-INSEN, OF PHILADELPHIA, PENNSYLVANIA.

ROTARY FAN.

SPECIFICATION forming part of Letters Patent No. 595,571, dated December14, 189'?- Application filed June 26,1898. Serial No. 478,808. (Nomodel.)

To all whom it may concern:

Be it known that 1, WILLIAM H. J oHNsEN, a citizen of the United States,residing in Philadelphia, Pennsylvania, have invented certainImprovements in Rotary Fans, of which the following is a specification.

The object of my invention is to dispense with the fixed casing of afanand also to utilize a pulley as a fan, an object which I attain bymaking the fan-casing rotate with the fan.

In the accompanying; drawings, Figure 1 is a perspective viewillustrating my invention as applied to a pulley. Fig. 2 is a sectionalView showing the casing and fan combined. Fig. 3 is an end view lookingin the direction of the arrow, Fig. 2. Fig. dis a View of an ordinarypulley, showing the fan in place. Fig. 5 is a view showing theapplication of my invention to a dynamo, and Fig. 6 is a view showingthe application of my invention to a ventilator.

Prior to my invention it has been the cus tom to make the casing of arotary fan a fixed structure, within which the fan rotates; but in manycases it is impossible to fix the casing in position. Consequently thefan has not been available. Myinvention overcomes this objection.

As shown in Fig. 1, the hub a of a pulley is mounted upon a shaft B inthe ordinary manner, and the spokes d are arranged in the form offan-blades, being inclined, as shown. The spokes, as shown in Fig. 1,may be cast with the rim 0; of the pulley or maybe bolted to the rim andhub, according to the construction of the pulley.

In Figs. 2 and 3 I have shown an extended rim a, which acts as a longflue for the passage of air, and in this instance I have shown fivefan-blades instead of four, as shown in Fig. 1.

In Fig. 4. I have shown an ordinary pulley with a fan structure mountedupon the shaft within the pulley.

In Fig. 5 I have shown myinvention as applied to a dynamo or motor, inwhich a draft of air is required to be passed through the armature, soas to keep the same cool and at the same time blow away particles ofdust or particles of metal that become detached from the commutator andwhich would otherwise gain access to the machine. It will be understoodthat the fan is mounted in the end opposite to the commutator, so that adraft of air through the dynamo will tend to keep the parts perfectlyclean and at the same time cool.

In Fig. 6 I have shown my invention as applied to an air-shaft orventilating-opening, the pulley having an extension which enters anopening in the wall, so that no fitting is required. All that isnecessary is to aline the shaft with the opening and mount the bracketsin proper position and then mount the fan-pulley upon the shaft.

I claim as my invention In a combined pulley and fan, the combination ofthe hub, the rim adapted to receive a belt, spokes connecting the rim tothe hub, said spokes being inclined in one direction so that on therotation of the pulley a current of air will pass therethrough the rimacting as a fine, substantially as described.

In testimony whereof I have signed my name to this specification in thepresence of two subscribing witnesses.

WILLIAM H. J OHN SEN.

Witnesses:

EDWIN O. FREEMAN, WILLIAM A. BARR.

